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Finding the Fourth Proportional to 1,431.68, 2,143.74 and 781.52

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Solution

The fourth proportional to 1,431.68, 2,143.74 and 781.52 is: 1,170.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,431.68 : 2,143.74 = 781.52 : x
  2. Step 2: Convert to fraction form
    1,431.68/2,143.74 = 781.52/x
  3. Step 3: Cross multiply
    1,431.68x = 2,143.74 × 781.52
  4. Step 4: Simplify right side
    1,431.68x = 1,675,375.68
  5. Step 5: Solve for x
    x = 1,675,375.68/1,431.68
  6. Step 6: Final answer
    x = 1,170.22

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.